91038086 has 4 divisors (see below), whose sum is σ = 136557132. Its totient is φ = 45519042.

The previous prime is 91038053. The next prime is 91038109. The reversal of 91038086 is 68083019.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68083019 = 1321 ⋅51539.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22759520 + ... + 22759523.

It is an arithmetic number, because the mean of its divisors is an integer number (34139283).

Almost surely, 2^91038086 is an apocalyptic number.

91038086 is a deficient number, since it is larger than the sum of its proper divisors (45519046).

91038086 is a wasteful number, since it uses less digits than its factorization.

91038086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45519045.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 91038086 is about 9541.3880541565. The cubic root of 91038086 is about 449.8568861775.

The spelling of 91038086 in words is "ninety-one million, thirty-eight thousand, eighty-six".